I use whatever's available at the moment -- anything from cheese, any kind of cooked meat, pieces of biscuits or bread, peanut butter, cooked veggies or rice (smushed up into a small ball).
Thanks for all the tips! Manni and I went to the pet store this morning and picked up four different flavors of the Wellness WellBites Soft & Chewy Treats. I opened up the Chicken/Venison flavor and *wow* does it have a strong smell. This is going to work great for recall training!
We also bought a Natural Balance Lamb Roll. I haven't opened that one yet, but the ingredients sure sound like Manni will love it.